Enhanced activation of peroxydisulfate by strontium modified BiFeO3 perovskite for ciprofloxacin degradation  

作　　者：Caicai Wang Shengwang Gao Jianchao Zhu Xunfeng Xia Mingxin Wang Yanna Xiong 

机构地区：[1]State Key Laboratory of Enuironmental Criteria and Risk Assessment,Chinese Research Academy of Environmental Sciences,Beijing 100012,China [2]State Environmental Protection Key Laboratory of Simulation and Control of Groundwater Pollution,Chinese Research Academy of Environmental Sciences,Beijing 100012,China [3]School of Environmental and Safety Engineering,Changzhou University,Changzhou 213164,China [4]Solid Waste and Chemicals Management Center,Ministry of Ecology and Environment,Beijing 100029,China

出　　处：《Journal of Environmental Sciences》2021年第1期249-259,共11页环境科学学报（英文版）

基　　金：the National Key Research and Development Program of China(Nos.2018YFD1100505,2019YFD1100201)。

摘　　要：A series of Sr-doped BiFeO3 perovskites(Bi1-xSrxFeO3,BSFO)fabricated via sol-gel method was applied as peroxydisulfate(PDS)activator for ciprofloxacin(CIP)degradation.Various technologies were used to characterize the morphology and physicochemical features of prepared BSFO samples and the results indicated that Sr was successfully inserted into the perovskites lattice.The catalytic performance of BiFeO3 was significantly boosted by strontium doping.Specifically,Bi0.9Sr0.1FeO3(0.1 BSFO)exhibited the highest catalytic performance for PDS activation to remove CIP,where 95%of CIP(10 mg/L)could be degraded with the addition of 1 g/L 0.1 BSFO and 1 mmol/L PDS within 60 min.Moreover,0.1 BSFO displayed high reusability and stability with lower metal leaching.Weak acidic condition was preferred to neutral and alkaline conditions in 0.1 BSFO/PDS system.The boosted catalytic performance can be interpreted as the lower oxidation state of Fe and the existence of affluent oxygen vacancies generated by Sr doping,that induced the formation of singlet oxygen(^1O_(2))which was confirmed as the dominant reactive species by radical scavenging studies and electron spin resonance(ESR)tests.The catalytic oxidation mechanism related to major ^1O_(2) and minor free radicals was proposed.Current study opens a new avenue to develop effective A-site modified perovskite and expands their application for PDS activation in wastewater remediation.

关 键 词：PEROVSKITE PEROXYDISULFATE Heterogeneous catalysis Singlet oxygen CIPROFLOXACIN 

分 类 号：X703[环境科学与工程—环境工程]